Module org.eclipse.persistence.jpa

Package org.eclipse.persistence.internal.jpa.querydef

Class SelectionImpl<X>

java.lang.Object

org.eclipse.persistence.internal.jpa.querydef.SelectionImpl<X>

All Implemented Interfaces:

Selection<X>, TupleElement<X>, Serializable, InternalSelection

Direct Known Subclasses:

CompoundSelectionImpl, ExpressionImpl

public abstract class SelectionImpl<X>
extends Object
implements Selection<X>, InternalSelection, Serializable

Purpose: Contains the implementation of the Selection interface of the JPA criteria API.

Description: The Selection is the expression describing what should be returned by the query.

Since:

EclipseLink 1.2

See Also:

• Join
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected String	alias
protected Expression	currentNode
protected Class<X>	javaType

Constructor Summary

Constructors

Constructor	Description
SelectionImpl(Class<X> javaType, Expression expressionNode)

Method Summary

Modifier and Type	Method	Description
Selection<X>	alias(String name)	Assign an alias to the selection.
String	getAlias()
List<Selection<?>>	getCompoundSelectionItems()	Return selection items composing a compound selection
Expression	getCurrentNode()	Returns the current EclipseLink expression at this node in the criteria expression tree
Class<? extends X>	getJavaType()
boolean	isCompoundSelection()	Whether the selection item is a compound selection
boolean	isConstructor()
boolean	isFrom()
boolean	isRoot()
void	setJavaType(Class<X> javaType)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.eclipse.persistence.internal.jpa.querydef.InternalSelection

findRootAndParameters

Field Details

javaType

protected Class<X> javaType

currentNode

protected Expression currentNode

alias

protected String alias

Constructor Details

SelectionImpl

public SelectionImpl(Class<X> javaType,
 Expression expressionNode)

Method Details

getCurrentNode

public Expression getCurrentNode()

Returns the current EclipseLink expression at this node in the criteria expression tree

Specified by:

getCurrentNode in interface InternalSelection

Returns:

the currentNode

alias

public Selection<X> alias(String name)

Assign an alias to the selection.

Specified by:

alias in interface Selection<X>

Parameters:

name - alias

getAlias

public String getAlias()

Specified by:

getAlias in interface TupleElement<X>

getJavaType

public Class<? extends X> getJavaType()

Specified by:

getJavaType in interface TupleElement<X>

setJavaType

public void setJavaType(Class<X> javaType)

getCompoundSelectionItems

public List<Selection<?>> getCompoundSelectionItems()

Return selection items composing a compound selection

Specified by:

getCompoundSelectionItems in interface Selection<X>

Returns:

list of selection items

Throws:

IllegalStateException - if selection is not a compound selection

isCompoundSelection

public boolean isCompoundSelection()

Whether the selection item is a compound selection

Specified by:

isCompoundSelection in interface Selection<X>

Returns:

boolean

isFrom

public boolean isFrom()

Specified by:

isFrom in interface InternalSelection

isRoot

public boolean isRoot()

Specified by:

isRoot in interface InternalSelection

isConstructor

public boolean isConstructor()

Specified by:

isConstructor in interface InternalSelection